I have been given a box of x7 FP4 expiration date 99. It has been stored in the back of the fride since it was bought. I needed a box to store exposed negs in but if the film might still be good I'll just use it. Is it worth keeping or should I just pitch it and keep the box to store exposed negs in before processing? There is also a box of ektachrome, same size, that was stored with the FP4 in the same refrigerator. Could this be worth keeping too.